All the adjustable differential does is increase or decrease the temperature of the low limits rise. If it's set at 160 with a diff of 15, it will start at 150 and go till 165 with no demand. Change it to 25 and it will still kick in at 150 and stop at 175. I would keep the adjustable diff. set as low as possable, it's not like oil, it may stop stoking but the temps will keep climbing with the fresh coals, it's not like oil you can turn on and off.Frytown wrote: Ive thought about changing the low limit differential to 5 degrees from 160, and keeping the high limit at differential of 10 degrees from 180. High limit aquastat is set at 200.
Will need to play around with it to see whats going on.
Do you have a big enough exp. tank, bad pressure relief valve, how high is the pressure and temp ? Is your high limit cut off working ? Excessive draft ? The expansion tank needs a precharge pressure before installed.Frytown wrote:Set my High Limit at 175 (down from 180) diff 10 and low limit at 155(down from 160) diff 10. Did this because the relief valve gets tripped of course never when I'm around, and have water in the bucket about 7 inches in a day and a half. Is there something else I should be doing?
Frytown wrote:Well, your the second person to mention the pressure tank. The Axeman Expert here said I should have got one that can hold 5.5 gallons or something like that. This is a T12 that holds 4.4 gallons. Wonder if the place that sold it to me would take it back???
You should be pumping away from the air scoop and the expansion tank. So the first thing the hot water will meet coming out of the boiler is the scoop/exp. tank.Frytown wrote:Another question. Should the Spirovent and expansion tank be located on the heat supply line going out instead of the return comming back? Going toi see if I can pick up new expansioin tank today at HD if they have bigger ones.